Claims
- 1. In an electromagnetic actuator for actuating a lifting valve of an internal combustion engine, the lifting valve having a valve shank, the actuator having two magnetic coils, an armature assembly comprising:an armature moved in oscillation between the two magnetic coils; said armature having an armature shank with an end portion; said armature shank being guided in the actuator; said end portion connected to and acting upon the valve shank; and at least portions of said armature shank being of a material having a specific gravity substantially lower than steel.
- 2. The armature assembly according to claim 1, wherein:said armature shank has a second end portion; an inductively operating measuring system for determining a position of said armature is disposed near said second end portion; and a portion of said second end portion is disposed at least in a region of the measuring system and is of a material having a relative permeability substantially lower than steel.
- 3. The armature assembly according to claim 2, wherein said second end portion is opposite said end portion.
- 4. The armature assembly according to claim 1, wherein said armature shank is produced completely from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 5. The armature assembly according to claim 1, wherein said armature shank is produced partially from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 6. The armature assembly according to claim 2, wherein said armature shank is produced completely from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 7. The armature assembly according to claim 2, wherein said armature shank is produced partially from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 8. The armature assembly according to claim 1, wherein different portions of said armature shank are of different materials respectively selected in terms of requirements relevant to each of said different portions.
- 9. The armature assembly according to claim 1, wherein:said armature shank has regions; and at least one region of said armature shank has a cross section that is reduced relative to other of said regions of said armature shank.
- 10. The armature assembly according to claim 1, wherein said end portion is of one of the group consisting of hardened steels, valve steel, rolling-bearing steel, tungsten carbide, SiN, Al2O3, CerMets, and nonoxidic metal ceramics.
- 11. The armature assembly according to claim 9, wherein:said armature shank has a central portion; and said at least one region is in said central portion.
- 12. The armature assembly according to claim 9, wherein said reduced cross-section is a peripheral groove.
- 13. The armature assembly according to claim 9, wherein said at least one region is of one of the group consisting of titanium, aluminum, Ti—Al alloys, and magnesium.
- 14. The armature assembly according to claim 2, wherein said portion of said second end portion is non-magnetic.
- 15. The armature assembly according to claim 14, wherein said portion is of one of the group consisting of titanium, titanium alloys, ceramics, austenitic steel, aluminum, aluminum alloys, and magnesium alloys.
- 16. An electromagnetic actuator for actuating a lifting valve of an internal combustion engine, the lifting valve having a valve shank, the actuator comprising:two magnetic coils; an armature moved in oscillation between said two magnetic coils; said armature having an armature shank with an end portion; said armature shank being guided in the actuator; said end portion connected to and acting upon the valve shank; and at least portions of said armature shank being of a material having a specific gravity substantially lower than that of steel.
- 17. The armature assembly according to claim 16, wherein:said armature shank has a second end portion; an inductively operating measuring system for determining a position of said armature is disposed near said second end portion; and a portion of said second end portion is disposed at least in a region of said measuring system and is of a material having a relative permeability lower than steel.
- 18. The armature assembly according to claim 17, wherein said second end portion is opposite said end portion.
- 19. The armature assembly according to claim 16, wherein said armature shank is produced completely from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 20. The armature assembly according to claim 16, wherein said armature shank is produced partially from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 21. The armature assembly according to claim 17, wherein said armature shank is produced completely from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 22. The armature assembly according to claim 17, wherein said armature shank is produced partially from one of the group consisting of titanium, a titanium alloy, and ceramic.
- 23. The armature assembly according to claim 16, wherein different portions of said armature shank are of different materials respectively selected in terms of requirements relevant to each of said different portions.
- 24. The armature assembly according to claim 16, wherein:said armature shank has regions; and at least one region of said armature shank has a cross section that is reduced relative to other of said regions of said armature shank.
- 25. The armature assembly according to claim 16, wherein said end portion is of one of the group consisting of hardened steels, valve steel, rolling-bearing steel, tungsten carbide, SiN, Al2O3, CerMets, and nonoxidic metal ceramics.
- 26. The armature assembly according to claim 24, wherein:said armature shank has a central portion; and said at least one region is in said central portion.
- 27. The armature assembly according to claim 24, wherein said reduced cross-section is a peripheral groove.
- 28. The armature assembly according to claim 24, wherein said at least one region is of one of the group consisting of titanium, aluminum, Ti—Al alloys, and magnesium.
- 29. The armature assembly according to claim 17, wherein said portion of said second end portion is non-magnetic.
- 30. The armature assembly according to claim 29, wherein said portion is of one of the group consisting of titanium, titanium alloys, ceramics, austenitic steel, aluminum, aluminum alloys, and magnesium alloys.
- 31. The armature assembly according to claim 16, wherein:said armature shank has regions; and at least one of said regions of said armature shank is a guide portion for guiding said armature shank.
- 32. The armature assembly according to claim 31, wherein said guide portion is of a material selected from the group consisting of hardened steel and ceramic.
- 33. The armature assembly according to claim 32, wherein said hardened steel is selected from the group consisting of valve steel and rolling-bearing steel.
- 34. The armature assembly according to claim 32, wherein said ceramic is selected from the group consisting of SiN and Al2O3.
- 35. The armature assembly according to claim 24, wherein:at least one of said regions of said armature shank is a guide portion for guiding said armature shank; and said guide portion is disposed adjacent said at least one region.
- 36. The armature assembly according to claim 31, wherein at least another of said regions is a spring plate portion.
- 37. The armature assembly according to claim 36, wherein said spring plate portion is disposed between said guide portion and said end portion.
- 38. The armature assembly according to claim 35, wherein:at least another of said regions is a spring plate portion; and said spring plate portion is disposed between said guide portion and said end portion.
- 39. The armature assembly according to claim 36, wherein said spring plate portion is of a martensitic material.
- 40. The armature assembly according to claim 1, wherein:said armature shank has regions; and at least one of said regions of said armature shank is a guide portion for guiding said armature shank.
- 41. The armature assembly according to claim 40, wherein said guide portion is of a material selected from the group consisting of hardened steel and ceramic.
- 42. The armature assembly according to claim 41, wherein said hardened steel is selected from the group consisting of valve steel and rolling-bearing steel.
- 43. The armature assembly according to claim 41, wherein said ceramic is selected from the group consisting of SiN and Al2O3.
- 44. The armature assembly according to claim 9, wherein:at least one of said regions of said armature shank is a guide portion for guiding said armature shank; and said guide portion is disposed adjacent said at least one region.
- 45. The armature assembly according to claim 40, wherein at least another of said regions is a spring plate portion.
- 46. The armature assembly according to claim 45, wherein said spring plate portion is disposed between said guide portion and said end portion.
- 47. The armature assembly according to claim 44, wherein:at least another of said regions is a spring plate portion; and said spring plate portion is disposed between said guide portion and said end portion.
- 48. The armature assembly according to claim 45, wherein said spring plate portion is of a martensitic material.
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 26 413 |
Jun 1999 |
DE |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of copending International Application No. PCT/EP00/03835, filed Apr. 27, 2000, which designated the United States.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5769043 |
Nitkiewicz |
Jun 1998 |
A |
6247431 |
Toriumi |
Jun 2001 |
B1 |
Foreign Referenced Citations (7)
Number |
Date |
Country |
196 11 547 |
Sep 1997 |
DE |
197 06 106 |
Aug 1998 |
DE |
197 43 913 |
Dec 1998 |
DE |
197 55 271 |
Jun 1999 |
DE |
0 376 716 |
Jul 1990 |
EP |
1 004 755 |
May 2000 |
EP |
03189312 |
Aug 1991 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP00/03835 |
Apr 2000 |
US |
Child |
10/013226 |
|
US |